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How to improve the bearing capacity of planetary gearbox

Industry news|2022-03-25| admin


The bearing capacity of the gearbox is also a criterion for judging the quality of the gearbox. The gearbox will also be applied to some high-load situations. In some specific cases, the bearing capacity of the gearbox is increased, and the impact on the equipment is also very large. So how to improve the bearing capacity of the gearbox, and what methods can be done.




1. Increase the contact stress of the ring gear


The check strength of the planetary gearbox is usually to check the transmission contact stress of the sun gear-planet gear, the bending stress of the sun gear-planet gear and the transmission contact stress of the planet gear-internal gear. The contact stress of the ring gear usually fails first, so in order to increase the bearing capacity, the contact stress of the ring gear must be guaranteed first.


2. Gear modification


Tooth profile modification, tooth root modification and tooth end modification are a good way to improve the transmission performance of heavy-duty gears, because for heavy-duty gears, tooth end modification can generally prevent tooth end overload caused by tooth orientation error.


3. Adjustment of displacement coefficient


Correct selection of the displacement coefficient can increase the gear carrying capacity by 20% to 30%.


4. Tooth root strengthening


The bending strength of gears has a great relationship with the surface condition of the tooth root. In particular, there are defects such as decarburization layer on the tooth root surface of carburized and quenched gear, which makes it difficult to ensure the residual pressure and reduce the bending fatigue strength of the tooth root. Therefore, tooth root strengthening measures are taken to improve the fatigue strength.


5. Increase the tooth width


Under the condition that the outer diameter of the planetary gearbox remains unchanged, appropriately increasing the width of the internal gear can effectively increase the bearing capacity of the gear.


6. Increase the gear module and increase the tooth angle.


The outer diameter of the planetary gearbox remains unchanged, and the bearing capacity needs to be increased, which can be satisfied by reasonably increasing the gear module and reducing the number of gear teeth.


7. Control gear accuracy and error


The tooth surface strength is not only related to the accuracy grade of the gear, but also to the absolute value of the pitch error. If the pitch error of the gear is large, the rolling pressure on the gear teeth is also large.


8. To choose a good gear material.

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